hg: jdk/sandbox: 8231293: Shenandoah: Traversal should not revive dead weak roots

[chris.hegarty at oracle.com]

Changeset: 501df37ce76b
Author:    zgu
Date:      2019-09-23 07:45 -0400
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/501df37ce76b

8231293: Shenandoah: Traversal should not revive dead weak roots
Reviewed-by: shade

! src/hotspot/share/gc/shenandoah/shenandoahBarrierSet.cpp
! src/hotspot/share/gc/shenandoah/shenandoahTraversalGC.cpp